<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	验证码：<a href="javascript:document.getElementById('image').src='getImg?'+Math.random();">
			<img src="getImg" id="image"/>
		</a>看不清点击图片切换
</body>
</html>